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Component of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss carry forwards $ 178,730 $ 146,300
Research tax credit carry forwards 34,064 29,658
Accruals and reserves 10,137 6,551
Capitalized research costs 943 1,422
Other 1,147 731
Total deferred tax assets 225,021 184,662
Less valuation allowance (224,746) (184,388)
Net deferred tax assets 275 274
Deferred tax liabilities:    
Fixed assets (275) (274)
Total deferred tax liabilities $ (275) $ (274)